Physics · Science General

Newtonian Mechanics and Forces

1,559 Questions

Newtonian mechanics studies the motion of objects and the physical laws governing them. This hub covers friction, gravitational force, inertia, and vector quantities. Mastering these fundamental physics concepts is essential for various government competitive exams.

Laws of motionFriction and inertiaVector and scalar quantitiesGravitational accelerationArchimedes principle

Newtonian Mechanics and Forces Questions

Multiple choice

Which of the following is not a force?

  1. Push

  2. Pull

  3. Gravity

  4. Sunlight
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Sunlight is electromagnetic radiation, not a force. Push and pull are fundamental ways forces manifest, and gravity is a natural force that attracts objects with mass toward each other. Forces involve push or pull interactions that can cause acceleration, whereas sunlight is energy in the form of electromagnetic waves.

Multiple choice

Newton is the unit of

  1. acceleration due to gravity

  2. velocity

  3. momentum

  4. force
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Newton is the SI unit of force, defined as the force required to accelerate a 1 kg mass at 1 m/s². Acceleration due to gravity is measured in m/s², velocity in m/s, and momentum in kg·m/s. This is a fundamental unit in physics named after Isaac Newton.

Multiple choice

Weight of a body

  1. changes with time

  2. changes with pressure

  3. changes with place

  4. remains the same

  5. changes with temperature
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Weight of a body changes with place.

Multiple choice

Which of the following is a scalar quantity?

  1. Displacement

  2. Velocity

  3. Acceleration

  4. Distance

  5. Angular momentum
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Those physical quantities that possess only magnitude but no specific direction are called scalar quantities. Distance is a scalar quantity.

Multiple choice

Motion of a child on a swing is

  1. oscillatory motion

  2. circular motion

  3. curvilinear motion

  4. rectilinear motion

  5. vibratory motion
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A motion in which an object describes to and fro or back and forth motion along the same path. This is the correct option.

Multiple choice

When a body moves with a constant speed along a circle, then

  1. no work is done

  2. no acceleration is produced in the body

  3. no force acts on the body

  4. its velocity remains constant
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Since force and displacement vector are perpendicular to each other when a body is moving in a circular path, so work done is 0 since we know that work done is the dot product of force applied and displacement of the particle.

Multiple choice

Choose the correct statement from amongst the following for translatory motion

  1. Only a particle can have a translatory motion

  2. Only regular shaped bodies may have translatory motion

  3. Any finite size body may have translatory motion

  4. All the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Translatory motion occurs when all points of a body move in the same direction with the same velocity. This can apply to any finite size body, regardless of its shape.

Multiple choice

Which of the following is an example of motion of rotation and motion of translation occurring at the same time?

  1. The spinning of a top

  2. A drill cutting through a metal piece

  3. A pendulum of a clock moving to and fro

  4. The moon revolving around the Earth

  5. A car moving in a straight line
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This is the correct option. A drill cutting through a metal piece is an example of motion of rotation and motion of translation occurring at the same time.

Multiple choice

Which law is associated with the rise of balloon in air?

  1. Parkinson law

  2. Gravitational law

  3. Law of motion

  4. Archimedes law.

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Archimedes' principle states that an object immersed in a fluid experiences an upward buoyant force equal to the weight of the fluid it displaces. A balloon rises because the gas inside is less dense than the surrounding air, creating a buoyant force greater than its weight.

Multiple choice

The product of mass and the velocity of a body is called

  1. displacement.

  2. speed.

  3. momentum.

  4. work.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In physics, linear momentum is defined as the product of an object's mass and its velocity (p = mv). It is a vector quantity that describes the motion of an object.